Where's the die break? I personally don't go for the doubled Lincoln in the memorial building. It's a plated cent and there are ways the plating can make it appear that way. Especially for such a tiny image.
Weird. If the TPG's were to attribute it would it have a special slab that magnifies the area of the Lincoln Memorial?
Not to my knowledge. Are you pulling my leg? LOL. The doubled knees are usually so small you need a 10X magnifier. Very minimal most times but they are legit.
Try using the "search" box at the top right. There are several that exist. http://numismedia.com/helpcenter/glossaryac.shtml https://conecaonline.org/glossary-of-error-variety-terms/ https://coins.ha.com/c/ref/glossary.zx#R https://coinappraiser.com/rare-coin-knowledge-center/coins-com-glossary-terms/ And several that members here have complied. For more, please do a separate post.